光储微电网逆变器低电压穿越控制策略研究
南京工程学院, 电力工程学院, 江苏南京 211167
| 摘 要： | 当配电网受到扰动或发生故障时，与其连接的微电网会突然脱离配电网进而导致一些严重后果。针对配电网电压跌落时微电网的低电压穿越（Low Voltage Ride Through, LVRT）能力，提出一种基于准谐振控制（Quasi Proportional Resonant, QPR）的光储微电网LVRT控制策略。光储微电网在电压暂降期间，通过储能装置消纳直流侧有功功率以维持直流母线电压稳定，减少换流器注入功率以避免过流；光伏逆变器采集两相静止坐标系下的并网点电压电流作为外环反馈以及滤波电容电流作为内环反馈，以提供内部等效虚拟阻抗，从而为滤波电路提供所需阻尼，并调制成PWM波直接控制交流量以减少谐波分量对光储微电网的影响。最后，在Matlab/Simulink中搭建仿真模型，研究表明，本文所提的控制策略能够有效控制直流母线电压，限制并网点电流，证实了该LVRT控制策略的合理性。 |
| 关 键 词： | 光储微电网; 低电压穿越; 准谐振控制器; 谐波分量 |
| DOI： | 10.57237/j.se.2023.01.006 |
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收稿日期: 2023-01-20
接受日期: 2023-02-16
在线出版日期: 2023-03-02
A Low Voltage Ride Through Control Strategy of Optical Storage Microgrid
School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
| Abstract: | When the distribution network is disturbed or fails, the microgrid connected to it will suddenly leave the distribution network and cause some serious consequences. Aiming at the low voltage ride through (LVRT) capability of the microgrid when the voltage of the distribution network drops, a control strategy of LVRT for the optical storage microgrid based on Quasi-resonant control (QPR) is proposed. During the voltage sag period of the optical storage microgrid, the active power at the DC side is absorbed by the energy-storage device to maintain the voltage stability of the DC bus, and the injection power of the converter is reduced to avoid over-current; The photovoltaic inverter collects the voltage and current at the junction point in the two-phase static coordinate system as the outer loop feedback and the filtered capacitor current as the inner loop feedback to provide the internal equivalent virtual impedance, thus providing the required damping for the filter circuit, and modulates it into a PWM wave to directly control the AC quantity to reduce the impact of the harmonic component on the optical storage microgrid. Finally, the simulation model is built in Matlab/Simulink, The research shows that the control strategy proposed in this paper can effectively maintain the stability of the DC bus voltage and limit the current of the junction point, which confirms the rationality of the LVRT control strategy. |
| Keywords: | Optical Storage Microgrid; Low Voltage Ride Through (LVRT); Quasi Proportional Resonant; Harmonic Component |
基金
| 1. | 南京工程学院科研基金项目 (ZKJ202102) |
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